CDC2510_15 Datasheet, PDF (3/13 Pages) Texas Instruments – 3.3V Phase-Lock Loop Clock Driver

CDC2510
3.3ĆV PHASEĆLOCK LOOP CLOCK DRIVER
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SCAS597B − DECEMBER 1997 − REVISED DECEMBER 2004
Terminal Functions
TERMINAL
NAME
NO.
CLK
24
TYPE
I
FBIN
13
I
G
11
I
FBOUT
12
O
3, 4, 5, 8, 9
1Y (0:9) 15, 16, 17, 20, O
21
AVCC
AGND
VCC
GND
23
Power
1
2, 10, 14, 22
6, 7, 18, 19
Ground
Power
Ground
DESCRIPTION
Clock input. CLK provides the clock signal to be distributed by the CDC2510 clock driver. CLK is used
to provide the reference signal to the integrated PLL that generates the clock output signals. CLK must
have a fixed frequency and fixed phase for the PLL to obtain phase lock. Once the circuit is powered
up and a valid CLK signal is applied, a stabilization time is required for the PLL to phase lock the
feedback signal to its reference signal.
Feedback input. FBIN provides the feedback signal to the internal PLL. FBIN must be hard-wired to
FBOUT to complete the PLL. The integrated PLL synchronizes CLK and FBIN so that there is
nominally zero phase error between CLK and FBIN.
Output bank enable. G is the output enable for outputs 1Y(0:9). When G is low, outputs 1Y(0:9) are
disabled to a logic-low state. When G is high, all outputs 1Y(0:9) are enabled and switch at the same
frequency as CLK.
Feedback output. FBOUT is dedicated for external feedback. It switches at the same frequency as
CLK. When externally wired to FBIN, FBOUT completes the feedback loop of the PLL. FBOUT has
and integrated 25-Ω series-damping resistor.
Clock outputs. These outputs provide low-skew copies of CLK. Output bank 1Y(0:9) is enabled via
the G input. These outputs can be disabled to a logic-low state by deasserting the G control input.
Each output has an integrated 25-Ω series-damping resistor.
Analog power supply. AVCC provides the power reference for the analog circuitry. In addition, AVCC
can be used to bypass the PLL for test purposes. When AVCC is strapped to ground, PLL is bypassed
and CLK is buffered directly to the device outputs.
Analog ground. AGND provides the ground reference for the analog circuitry.
Power supply
Ground
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